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July 9th, 2008, 12:06 AM
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TTA Stock Turbo Question
I have a customer with an old, original ad for the TTA. Not only does it say that the car will be produced with a roller cam (never happened), but it also says that the turbo's center section was water cooled. He believes he had seen one of the hardtop Indy cars with a water cooled center section (which could be true I guess). I told him that my understanding is that the TTAs were produced with a non-water cooled center section. We are both just curious about the truth from someone here that knows. Thanks
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www.EpitomeExclusives.com Collectible Quality, Brand New 1987 Grand National/GNX Grilles and Headlight Bezels At Less Than 1/2 The Current Price Of Originals! Sharpen Your Look And Stash Those Expensive Originals Today!.......ORDER THEM NOW! 1987 GN Cotton Engineered and Modified Stage 2 On-Center Motor     
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July 9th, 2008, 01:59 AM
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Magazine rumors. I have an article that states they have S.S. headers as well. Some have claimed adjustable wastegates......... I imagine the list will go on.
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Frank TTA#1416 11.78 @ 117 1.86 60'
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July 9th, 2008, 06:35 AM
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No water cooled. SS headers yes. The TTA turbo is the same as a gn but the wastegate hole is bigger for controlled boost. Part number is different too.
HTH Bo
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89 TTA with built 109 .040 over J&E pistons,K1 rods,billet steel caps,steel crank,224/224 flat tappet comp cam,HV front cover,port matched intake,fully ported TTA heads,PT70 turbo,KM sheet metal intake,50# injectors,billet fuel rails,TT chip,NX nitrous wet shot system,3'' THDP,SM2,Razors alky injection,vigilante 3200 stall,fully built tranny,drag bags,convo pro wheels,15x9x30 Hoosier slicks in back with 15x3.5x28 skinnies up front. 6pt cage for now. Coming soon to a strip near YOU!  
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July 9th, 2008, 02:21 PM
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Just as I thought....thanks
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www.EpitomeExclusives.com Collectible Quality, Brand New 1987 Grand National/GNX Grilles and Headlight Bezels At Less Than 1/2 The Current Price Of Originals! Sharpen Your Look And Stash Those Expensive Originals Today!.......ORDER THEM NOW! 1987 GN Cotton Engineered and Modified Stage 2 On-Center Motor
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July 9th, 2008, 05:34 PM
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Early in the planing stages of the TTA they wanted to have a roller cam but was droped due to cost. The TTA never came with a water cooled turbo. The TTA did however come with a different turbo but it had the same size waste gate hole. The difference was the better flowing compressor housing. As for the adjustable waste gates I have seen the cars with and without. Most with. A lot of these cars would go to the dealer for service and the so-called mechanic would see oil in the inlet bell and condem the turbo. The oil would be coming from the vent on the valve cover. To make maters worse they would order a replacement and it would be a GN turbo and not be the correct turbo.
Steve K. Last edited by skturbo : July 9th, 2008 at 05:37 PM.
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July 9th, 2008, 09:11 PM
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Steve,
I think your talking about the replacement turbo for the GN. That turbo has the bigger housing. The TTA had a wastgate hole dia. of .912-933" vs GN .820 Some of the cars had adj. WG that could move .015 of movement for .5+ PSI gain. Just from my sources...Although could be skewed a bit. 
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89 TTA with built 109 .040 over J&E pistons,K1 rods,billet steel caps,steel crank,224/224 flat tappet comp cam,HV front cover,port matched intake,fully ported TTA heads,PT70 turbo,KM sheet metal intake,50# injectors,billet fuel rails,TT chip,NX nitrous wet shot system,3'' THDP,SM2,Razors alky injection,vigilante 3200 stall,fully built tranny,drag bags,convo pro wheels,15x9x30 Hoosier slicks in back with 15x3.5x28 skinnies up front. 6pt cage for now. Coming soon to a strip near YOU!
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July 9th, 2008, 10:04 PM
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Your right. You are skewed a bit.
 The TTA came with a compressor housing that had raised "Garrett" letters not stamped into the casting. It also had a square with a "L" in it. It had a wider grove cut into the inside of the housing for improved flow. The grove on the GN was .210 and the TTA was .236 .026 wider. It had the same size compressor & turbine wheels as the GN. The housing on the left is a original TTA housing the right is a GN. Steve K.
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July 9th, 2008, 10:21 PM
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Jim from NE Philly 87 Buick Grand National w/ all the typical mods. Fresh rebuilt everything! 86 Buick Grand National Astroroof. 82K Sexy Stocker!  89 Turbo Trans AM #396 w/ 30K on it. T-tops leather. Featured in Hemmings Muscle Machines. Feb. 06 issue #29  http://turbobuicks.net/gallery2/v/Philly/ Pennsylvania State Representative for MAGNA Join Today! http://www.magnabuick.com/ TTA owners sign in.. http://www.turbotransam.com
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July 10th, 2008, 07:53 PM
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My car came with a non adjustable wastegate actuator. The chip was to control the boost. I don't think GM would want to "encourage" anyone to "try" the adjustability of something that could easily void the warranty.
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89 TTA -first and original owner, 34k miles. www.my89turbotransam.com BB CPT-61, THDP, 60# inj., Electronic dump pipe, SMC Alcy Inj. stock exhaust from cat back. 
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